($ in millions except per share amounts)

​

​

​

​

​

​

​

​

​

For the year ended December 31:

2020

2019

2018

Weighted-average number of shares on which earnings per share calculations are based

​

​

​

​

Basic

890,348,679

​

887,235,105

912,048,072

Add—incremental shares under stock-based compensation plans

4,802,940

​

4,199,440

2,786,316

Add—incremental shares associated with contingently issuable shares

1,412,352

​

1,378,831

1,481,326

Assuming dilution

896,563,971

​

892,813,376

916,315,714

Income from continuing operations

​

$

5,501

​

$

9,435

​

$

8,723

Income/(loss) from discontinued operations, net of tax*

​

89

​

(4)

​

5

Net income on which basic earnings per share is calculated

​

$

5,590

​

$

9,431

​

$

8,728

Income from continuing operations

​

$

5,501

​

$

9,435

​

$

8,723

Net income applicable to contingently issuable shares

​

(2)

​

0

​

(6)

Income from continuing operations on which diluted earnings per share is calculated

​

$

5,499

​

$

9,435

​

$

8,718

Income/(loss) from discontinued operations, net of tax, on which basic and diluted earnings per share is calculated*

​

89

​

(4)

​

5

Net income on which diluted earnings per share is calculated

​

$

5,588

​

$

9,431

​

$

8,722

Earnings/(loss) per share of common stock

​

​

​

​

​

Assuming dilution

​

​

​

​

​

Continuing operations

​

$

6.13

​

$

10.57

​

$

9.51

Discontinued operations

​

0.10

​

(0.01)

​

0.01

Total

​

$

6.23

​

$

10.56

​

$

9.52

Basic

​

​

​

​

​

Continuing operations

​

$

6.18

​

$

10.63

​

$

9.56

Discontinued operations

​

0.10

​

0.00

​

0.01

Total

​

$

6.28

​

$

10.63

​

$

9.57

​

​

​

​

​

​

​

​

​

​